精子末段解剖名。长5～7μm，由中心轴丝和外周细胞膜构成。
尾部又分4段：颈段、中段、主段和末段。
The tail consists of 4 segments: neck region, midpiece, principle piece and endpiece.
他们在国际空间站外花了几个小时，在处于机器人手臂末段模拟维修。
They spent several hours outside the International Space Station, conducted simulated repairs while perched at the extended end of a robotic arm.
套管壳体的最高温度出现在套管出口位置，应适当加强套管末段的热防护。
The hottest position of the tube is at the exit, so the heat protection is needed at the downstream part of the tube.
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